CO/sup +//sub 2/(A--X and B--X) emissions resulting from the He(2 /sup 3/S)+CO/sub 2/ Penning ionization

Journal Article · Fri Oct 15 04:00:00 EDT 1982 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.444312· OSTI ID:7040020

Endoh, M; Tsuji, M; Nishimura, Y

CO/sup +//sub 2/ (A /sup 2/Pi/sub u/--X /sup 2/Pi/sub g/) and CO/sup +//sub 2/ (B /sup 2/..sigma../sup +//sub u/-X /sup 2/Pi/sub g/) emissions produced from the He(2 /sup 3/S)+CO/sub 2/ Penning ionization have been observed in a flowing afterglow apparatus. The fluorescence branching ratio of the A /sup 2/Pi/sub u/ and B /sup 2/..sigma../sup +//sub u/ states, and the vibrational populations of the A state were determined as a function of helium pressure. The fluorescence branching ratio of the A and B states was independent of the helium pressure at 0.5--1.0 Torr. Meanwhile, a significant relaxation was found for the vibrational distribution of the A state in the helium pressure range from 0.5 to 5 Torr. The unrelaxed vibrational distribution of the A state was determined from the 62 A--X bands. The fluorescence branching ratio I/sub A//I/sub B/ was about four times larger than the initial population ratio of the A and B states determined by electron spectroscopy, and the vibrational populations of the A state shifted to higher upsilon/sub 1/' levels (upsilon/sub 1/' = 3,4, and 5). These discrepancies between the PIOS and PIES results have been interpreted as due to interelectronic state coupling between the B and A states.

• Research Organization: Department of Molecular Science and Technology, and Research Institute of Industrial Science, Kyushu University, Kasuga, Fukuoka 816, Japan
• OSTI ID: 7040020
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 77:8; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
AFTERGLOW
ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
COLLISIONS
ELEMENTS
EMISSION SPECTRA
FLUIDS
FLUORESCENCE
GASES
HELIUM
IONIZATION
LUMINESCENCE
MOLECULE COLLISIONS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PENNING EFFECT
RARE GASES
SPECTRA